Collar attachment



FIG. 1 is a perspective view of a collar attachment;

FIG. 2 is a top plan view of a collar attachment;

FIG. 3 is a bottom plan view of a collar attachment;

FIG. 4 is a front elevation view of a collar attachment;

FIG. 5 is a rear elevation view of a collar attachment;

FIG. 6 is a right side elevation view of a collar attachment; and,

FIG. 7 is a left side elevation view of a collar attachment.

The broken lines in the drawings represent unclaimed environment only and form no part of the claimed design. 

CLAIM The ornamental design of a collar attachment, as shown and described. 